Electric heater



Feb. 17, 1925.

P. RAUCHFUSS ELECTRIC HEATER Filed Nov. l, 1922 m r .I

IVM/emmer-d paul Fauchfuss;

HisALLorrwe.

citizen of the German Realm,

Patented Feb. A17, 19m25.

UNITED STATES PAUL; naUcHrUss, orV BEnmN, GERMANY,

.ASSIGNOR TO GENERAL ELECTRIC COI- PANY, A CORPORATION `CIF NEW YORK.

ELECTRIC HEATER.

Application med November 1, 1922. Serial No. 598,401.

To all 'whom 'it may concern:

Be it known that I, PAUL RAUcHr'Uss, a residing at the city of Berlin,Germany, have invented certain new and useful Improvements in ElectricHeaters, a specification.

.This invention relates to electric heaters,

- more particularly to heaters in which the liquid itself forms theheating resistance, such, for example, as used in steam boilers, and hasfor its object the provision of means whereby such heaters may beregulated in a simple, reliable and eflicient manner.

The regulation of the consumption of energy in steam boilers heatedelectrically on other, or by adjusting insulating tubes, or

by several of thesel methods of adjustment in common.

More specifically the present vinvention relates to the regulation ofthe consumption of energy in steam boilers electrically heated on theelectrode principle, having stationary electrodes and adjustableinsulating tubes. In one form of my invention the insulating tubes,which are adapted to be adjusted in the direction of their longitudinalaxis, are inserted at their upper ends in stationary insulating tubeswhich gradually become narrower and which are arranged above the saidupper ends. By means of this arrangement the resistance of the passagefor the liquid may be very gradually increased by lifting the lowerinsulating tubes, an extremely fine regulation of the consumption ofenergy thus being obtained. The movable insulating tubes may be toadvantage arranged on a common cross-piece and this may be lifted andlowered from below from a regulating rod, for example by means of wormsand gear wheels.

The drawm shows one illustrative embodiment of the invention inlongitudinal section;

f Referring to the drawing, a indicates the velectrodes :located in theboiler b. They are A 'carried on the inner end of currentsupply of whichthe following isl bars or rods o which project outside the boiler bthrough suitable insulators 1. The electrodes are stationary, beingositioned so that they are submerged to t e desired extent in the liquidin the boiler. The electrodes are in a well known `manner surrounded byinsulating members or tubes d,

the upper ends of which may be inserted in insulating members or tubes eof conical form which broaden gradually in a downward direction. Theseinsulating tubes e are arranged in a stationary manner on a suitableholder f, whilethe insulating tubes d rest on a common cross piece g andmay be lifted and lowered with the latter from the regulatin -rod Z. Byreason of the annular space tween the insulatingl tubes d and e, whichspace, in consequence of the conical shape of the insulating tube enarrows radually as the insulating tubes d rise, t e resistance of theli uid path becomes greater gradually and accordingly regulates verygradually the consumption of ener y.

at I claim as new and'desire to secure by Letters Patent of the UnitedStates, is

1. An electric heater for liquids comprising a plurality of electrodesimmersed in the liquid to be heated, cooperating insulating memberssurrounding one of said electrodes, said insulating members telescopingone within the other, and means for adjusting said members axially withrelation to each other so as to vary the liquid path between saidelectrodes.

2. An electric heater for liquids comprising a pluralit of electrodesimmersed in the liquid to heated, a air of tubular insulating memberssurroun ing each of said electrodes, one of the members in each pairbeing conical, and means for ad'usting the members in each pair withrelation to each other so as to vary the liquid path between saidelectrodes.

3. An electric heater for liquids comprising a pluralit of electrodesimmersed in the liquid to e heated, stationary conical tubularinsulating members surrounding said electrodes, movable insulating tubessurrounding said electrodes and cooperating with said stationarinsulatin members, and means for adjusting sai insulating 4tubes so asto vary the liquid path between said electrodes.

4. An electric heater for liquids comprising a pluralit of electrodesimmersed in said support so as to adjust said insulating the liquid to eheated, stationary conical tubes along their longitudinal axesWithretubular insulating members surrounding lation to said conicalmembers and vary the 10 said electrodes, movable insulating tubes liquidpath between said electrodes.

5 surrounding said electrodes and inserted in In Witness whereof I havehereunto set said conical members, a common support for my hand this 9thda of October, 1922. said insulating tubes,4 and means for moving P ULRAUCHFUSS.

